<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style media="screen">
    html *{
      padding: 0;
      margin: 0;
    }
    .layout {
      margin-top: 20px;
    }
    .layout article div{
      min-height: 100px;
    }
  </style>
</head>
<body>
    <section class="layout float">
      <style media="screen">
        .layout.float .left {
          float: left;
          width: 300px;
          background: red;
        }
        .layout.float .right {
          float: right;
          width: 300px;
          background: blue;
        }        
        .layout.float .center {
          background: yellow;
        }
      </style>
      <article class="left-right-center">
        <div class="left"></div>
        <div class="right">
          
        </div>
        <div class="center">
          <h1>浮动解决方案</h1>

        </div>
      </article>
    </section>
    <section class="layout absolute">
      <style media="screen">
        .layout.absolute .left-center-right>div {
          position: absolute;
        }
        .layout.absolute .left {
          left: 0;
          width: 300px;
          background: red;
        }
        .layout.absolute .center {
          left: 300px;
          right: 300px;
          background: yellow
        }
        .layout.absolute .right {
          right: 0px;
          width: 300px;
          background: blue
        }
      </style>
      <article class="left-center-right">
        <div class="left"></div>
        <div class="center">
          <h1>绝对定位解决方案</h1>
          1.这是三栏布局的中间部分
        </div>
        <div class="right"></div>
      </article>
    </section>

    <section class="layout flexbox">
      <style media="screen">
        .layout.flexbox {
          margin-top: 140px;
        }
        .layout.flexbox .left-center-right {
          display: flex;
        }
        .layout.flexbox .left {
          width: 300px;
          background: red;
        }
        .layout.flexbox .center {
          flex: 1;
          background: yellow;
        }
        .layout.flexbox .right {
          width: 300px;
          background: blue;
        }

      </style>
      <article class="left-center-right">
        <div class="left"></div>
        <div class="center">
          <h1>flexbox解决方案</h1>
          1.这是三栏布局的中间部分
        </div>
        <div class="right"></div>
      </article>
    </section>

    <section class="layout table">
      <style media="screen">
        
        .layout.table .left-center-right {
          display:table;
          width: 100%;
          height: 100px;
        }
        .layout.table .left-center-right>div {
          display: table-cell;
        }
        .layout.table .left {
          width: 300px;
          background: red;
        }
        .layout.table .center {
          background: yellow;
        }
        .layout.table .right {
          width: 300px;
          background: blue;
        }

      </style>
      <article class="left-center-right">
        <div class="left"></div>
        <div class="center">
          <h1>表格解决方案</h1>
          1.这是三栏布局的中间部分
        </div>
        <div class="right"></div>
      </article>
    </section>

    <section class="layout grid">
      <style media="screen">
        
        .layout.grid .left-center-right {
          display:grid;
          width: 100%;
          grid-template-rows: 100px;
          grid-template-columns: 300px auto 300px;
        }
        .layout.grid  .left {
          background: red;
        }

        .layout.grid .center {
          background: yellow;
        }

        .layout.grid .right {
          background: blue;
        }

      </style>
      <article class="left-center-right">
        <div class="left"></div>
        <div class="center">
          <h1>网格解决方案</h1>
          1.这是三栏布局的中间部分
        </div>
        <div class="right"></div>
      </article>
    </section>
</body>
</html>